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<Title>Missing Data Points</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Missing Data Points</p>
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<img src="images/missingpoints.jpg" width='600' height='360'>
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This example demonstrates various methods to representing missing data points. It also demonstrates automatic resizing of the plot area to fit the chart.<br><br>
In ChartDirector, a data series may contain missing values, represented using the <a href="Chart.NoValue.htm">NoValue</a> predefined constant. In a line layer, by default, a missing value is represented as a gap in the line. In other words, the line will be broken. <a href="LineLayer.setGapColor.htm">LineLayer.setGapColor</a> can be used to configure the line layer to join through the NoValue point instead, using a line segment that can be of a different color and/or style.<br><br>
In this example, the three data series all contain <a href="Chart.NoValue.htm">NoValue</a> points. The red line demonstrates the default behaviour of using a gap to representing the NoValue point. The green line demonstrates joining through the NoValue point with a dash line. The orange line demonstrates joining through the NoValue point with the same line style as for joining normal data points.<br><br>
After the entire chart is configured, the <a href="XYChart.packPlotArea.htm">XYChart.packPlotArea</a> method is used to adjust the plot area size, so as to fit the plot area and the axes in a given bounding box.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/missingpoints.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The data for the chart
double[] data0 = {42, 49, Chart.NoValue, 38, 64, 56, 29, 41, 44, 57};
double[] data1 = {65, 75, 47, 34, 42, 49, 73, Chart.NoValue, 90, 69, 66, 78};
double[] data2 = {Chart.NoValue, Chart.NoValue, 25, 28, 38, 20, 22, Chart.NoValue, 25, 33, 30, 24};
String[] labels = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov",
    "Dec"};

// Create a XYChart object of size 600 x 360 pixels. Set background color to brushed silver, with a
// 2 pixel 3D border. Use rounded corners.
XYChart c = new XYChart(600, 360, Chart.brushedSilverColor(), Chart.Transparent, 2);
c.setRoundedFrame();

// Add a title using 18pt Times New Roman Bold Italic font. #Set top/bottom margins to 6 pixels.
TextBox title = c.addTitle("Product Line Global Revenue", "Times New Roman Bold Italic", 18);
title.setMargin2(0, 0, 6, 6);

// Add a separator line just under the title
c.addLine(10, title.getHeight(), c.getWidth() - 11, title.getHeight(), Chart.LineColor);

// Add a legend box where the top-center is anchored to the horizontal center of the chart, just
// under the title. Use horizontal layout and 10 points Arial Bold font, and transparent background
// and border.
LegendBox legendBox = c.addLegend(c.getWidth() / 2, title.getHeight(), false, "Arial Bold", 10);
legendBox.setAlignment(Chart.TopCenter);
legendBox.setBackground(Chart.Transparent, Chart.Transparent);

// Tentatively set the plotarea at (70, 75) and of 460 x 240 pixels in size. Use transparent border
// and black (000000) grid lines
c.setPlotArea(70, 75, 460, 240, -1, -1, Chart.Transparent, 0x000000, -1);

// Set the x axis labels
c.xAxis().setLabels(labels);

// Show the same scale on the left and right y-axes
c.syncYAxis();

// Set y-axis tick density to 30 pixels. ChartDirector auto-scaling will use this as the guideline
// when putting ticks on the y-axis.
c.yAxis().setTickDensity(30);

// Set all axes to transparent
c.xAxis().setColors(Chart.Transparent);
c.yAxis().setColors(Chart.Transparent);
c.yAxis2().setColors(Chart.Transparent);

// Set the x-axis margins to 15 pixels, so that the horizontal grid lines can extend beyond the
// leftmost and rightmost vertical grid lines
c.xAxis().setMargin(15, 15);

// Set axis label style to 8pt Arial Bold
c.xAxis().setLabelStyle("Arial Bold", 8);
c.yAxis().setLabelStyle("Arial Bold", 8);
c.yAxis2().setLabelStyle("Arial Bold", 8);

// Add axis title using 10pt Arial Bold Italic font
c.yAxis().setTitle("Revenue in USD millions", "Arial Bold Italic", 10);
c.yAxis2().setTitle("Revenue in USD millions", "Arial Bold Italic", 10);

// Add the first line. The missing data will be represented as gaps in the line (the default
// behaviour)
LineLayer layer0 = c.addLineLayer2();
layer0.addDataSet(data0, 0xff0000, "Quantum Computer").setDataSymbol(Chart.GlassSphere2Shape, 11);
layer0.setLineWidth(3);

// Add the second line. The missing data will be represented by using dash lines to bridge the gap
LineLayer layer1 = c.addLineLayer2();
layer1.addDataSet(data1, 0x00ff00, "Atom Synthesizer").setDataSymbol(Chart.GlassSphere2Shape, 11);
layer1.setLineWidth(3);
layer1.setGapColor(c.dashLineColor(0x00ff00));

// Add the third line. The missing data will be ignored - just join the gap with the original line
// style.
LineLayer layer2 = c.addLineLayer2();
layer2.addDataSet(data2, 0xff6600, "Proton Cannon").setDataSymbol(Chart.GlassSphere2Shape, 11);
layer2.setLineWidth(3);
layer2.setGapColor(Chart.SameAsMainColor);

// layout the legend so we can get the height of the legend box
c.layoutLegend();

// Adjust the plot area size, such that the bounding box (inclusive of axes) is 15 pixels from the
// left edge, just under the legend box, 16 pixels from the right edge, and 25 pixels from the
// bottom edge.
c.packPlotArea(15, legendBox.getTopY() + legendBox.getHeight(), c.getWidth() - 16, c.getHeight() -
    25);

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart
viewer.setImageMap(c.getHTMLImageMap("", "",
    "title='Revenue of {dataSetName} in {xLabel}: US$ {value}M'"));
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Missing Data Points&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Missing Data Points
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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